WO2002014799A1 - Procede servant a mesurer un debit et debitmetre - Google Patents
Procede servant a mesurer un debit et debitmetre Download PDFInfo
- Publication number
- WO2002014799A1 WO2002014799A1 PCT/JP2001/006923 JP0106923W WO0214799A1 WO 2002014799 A1 WO2002014799 A1 WO 2002014799A1 JP 0106923 W JP0106923 W JP 0106923W WO 0214799 A1 WO0214799 A1 WO 0214799A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flow
- flow rate
- temperature
- fluid
- measurement
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
Definitions
- Flow meters are used to measure the flow of kerosene, water, gas and other fluids consumed in homes and businesses.
- a thermal (especially indirectly heated) flow sensor that is easy to reduce in price is used.
- an indirectly heated flow sensor a sensor chip consisting of a thin-film heating element and a thin-film temperature sensing element laminated on a substrate via an insulating layer using thin-film technology is connected to a pipe (flow meter that communicates with external pipes).
- An arrangement is used in which heat transfer (that is, thermal interaction) can be performed with the fluid inside (including the fluid flow passage provided inside).
- the temperature sensing element is heated by energizing the heating element to change the electrical characteristics of the temperature sensing element, for example, the value of the electrical resistance.
- This change in the electric resistance value changes according to the flow rate (flow velocity) of the fluid flowing in the pipe. This is because part of the heat generated by the heating element is transmitted into the fluid, and the amount of heat diffused into the fluid and absorbed by the fluid changes according to the flow rate (flow velocity) of the fluid. This is because the amount of heat supplied to the temperature sensing element changes, and the electrical resistance value of the temperature sensing element changes.
- the change in the electric resistance of the thermosensitive element also depends on the temperature of the fluid. Therefore, a temperature-compensating thermosensitive element is incorporated in the electric circuit for measuring the change in the electric resistance of the thermosensitive element. In addition, changes in flow measurement values due to fluid temperature are also minimized.
- Such an indirectly heated flow sensor using a thin film element is described, for example, in Japanese Patent Application Laid-Open No. H11-118566.
- a bridge circuit is provided to obtain an electrical output corresponding to the flow rate of the fluid.
- electrical circuits including:
- an object of the present invention is to perform a flow measurement with a small measurement error even when a fluid to be measured changes its volume due to a temperature change.
- the invention aims to provide a method and a flow meter for such a flow measurement. Disclosure of the invention
- a plurality of individual calibration curves indicating the relationship between the electric output of the electric circuit and the flow rate for each discrete temperature value are used as the calibration curve, and the flow rate is converted into a flow rate at a reference temperature when the individual calibration curve is created.
- each of the individual calibration curves is created for discrete values among possible values of the electric output of the electric circuit, and the measurement is performed by performing an interpolation calculation.
- the flow rate value corresponding to the temperature is obtained.
- the flow rate conversion circuit performs an interpolation operation based on the temperature measured by the temperature measuring means and the plurality of individual calibration curves to obtain a calibration flow value corresponding to the temperature at the time of measurement.
- the fluid to be measured is a mixture of a plurality of types of molecules having different molecular weights, for example, kerosene.
- the reference temperature is a temperature within the range of 14 to 16 ° C. - ⁇
- FIG. 3 is an exploded sectional view showing an embodiment of the flow meter according to the present invention.
- FIG. 4 is a sectional view showing an embodiment of the flow meter according to the present invention.
- FIG. 6 is a plan view showing an embodiment of the flow meter according to the present invention.
- FIG. 8 is a block diagram showing a schematic configuration of an electric circuit section of the flow meter according to the present invention.
- the housing of the flow meter includes a main body member 2 and an outer lid member 4.
- the main body member 2 is made of die-cast aluminum or zinc, and the housing body member 2 has an outer lid member 4 made of die-cast aluminum or zinc in a specific direction (the direction of arrow A). Adapted by screwing.
- a fluid inlet pipe 21 is formed on one side of the housing body member 2, and a fluid outlet pipe 22 is formed on the other side.
- the housing main body member 2 is formed with two compartments. One compartment is an upper concave portion 23 for a storage portion, and the other is a lower concave portion 24 for a circuit member.
- the recess 23 for the storage part is defined by the inner wall 26.
- the outer peripheral surface of a die-cast inner lid member 6 made of aluminum, zinc, or the like is fitted with a screw in the direction of arrow A with respect to the end surface of the inner wall 26 so as to cover the recessed portion 23 for the storage portion.
- rubber seals (such as corkscrew with cork) are interposed to prevent leakage of fluid from the conforming part.
- a fluid storage portion for temporarily storing and distributing the fluid is formed between the housing body member 2 and the inner lid member 6.
- the housing body member 2 is formed with an opening 21a communicating with the fluid inlet pipe 21 and opening at the recess 23 for the reservoir, and communicating with the fluid outlet pipe 22 and forming a recess for the reservoir.
- a connection opening 22 a opened at 23 is provided.
- a fluid flow path defining member 9 is attached to the inner lid member 6.
- the flow path defining member 9 defines the flow path of the fluid flowing from the opening 21a in the fluid storage section by fitting the inner lid member 6 to the housing body member 2. Through the opening 21a, and then to the area where the flow rate measuring section 8 is arranged through the rush-shaped opening between the lower edge of the flow path defining member 9 and the bottom of the fluid storage section. It is to be.
- the form in which the measurement flow passage 81 of the flow measurement unit 8 extends in the vertical direction is shown.
- the opening at the lower end of the measurement flow passage 81 is a fluid inlet, and the opening at the upper end is closed by the inner wall surface of the housing body member 2 by fitting the inner lid member 6 to the housing body member 2.
- a horizontal hole in the direction of arrow A is formed in the flow measurement section 8, and this is a fluid outlet 81a.
- the fluid outlet 81a and the connection opening 22a on the housing body member 2 side are arranged at positions corresponding to the direction of arrow A, and a 0-ring is interposed between them.
- Road joint 8a is arranged.
- the flow rate measuring section 8 has two sensor insertion holes 8b connected to the measurement flow path 81, one of which has a flow rate sensor 10 and the other has a fluid temperature detection sensor 10 '. Each is inserted with an O-ring interposed.
- the flow rate sensor 10 is configured such that the fin plate FP and the flow rate detection section FS are joined by a bonding material AD having good heat conductivity, and the electrode pad of the flow rate detection section FS and the external electrode terminal ET are provided. Can be connected with a bonding wire BW and sealed with a mold resin MR.
- the fluid temperature detection sensor 10 'shall use a fluid temperature detection unit instead of the flow detection unit FS in the flow sensor 10 and have an external electrode terminal ET corresponding to this.
- the flow rate detecting section and the fluid temperature detecting section those described in JP-A-11-118566 can be used.
- the flow rate measuring section 8 is provided with a temperature sensor 112 for detecting the temperature of the fluid in the measurement flow passage 81. Since the flow measuring unit 8 has good thermal conductivity, the temperature thereof is almost the same as the temperature of the fluid in the measuring flow passage 81. Therefore, the fluid temperature can be measured by measuring the temperature of the flow rate measuring unit 8 near the measurement flow passage 81 with the temperature sensor 112.
- These sensors 110, 10 ', and 12 are fixed in position by a pressing member 42, and an analog circuit board 44 is disposed thereon.
- the analog circuit board 44 is electrically connected to the external electrode terminals ET of the flow rate sensor 10 and the fluid temperature detection sensor 10 '.
- the outer cover member 4 includes a digital circuit board 34 constituting a flow rate detection circuit together with the analog circuit board 44, a transformer 36 constituting a power supply circuit section, and a power supply board serving as an input / output terminal section for the flow meter. 46 and 48 are attached, and a power supply cable attachment terminal 50 is attached to the power supply board 48.
- the transformer 36 and the input / output terminal are arranged in the recess 24 for the circuit member.
- a liquid crystal display element LCD is attached to the digital circuit board 34, and the instantaneous flow value or the integrated flow value of the digital display can be externally observed through the cover plate 52.
- a detachable screw 53 is attached to the upper surface of the housing body member 2 for venting the air in the fluid reservoir. By removing the screw 53, unnecessary air remaining in the upper part in the storage part can be discharged.
- a communication cable connector 56 is arranged inside the housing body 2.
- a power cable bush 58 is attached to the lower surface of the housing body member 2.
- a display section 60 using a liquid crystal display element LCD is arranged on a front portion of the housing body member 2.
- the fluid is supplied from the fluid supply source to the fluid demanding device via the storage section of the flow meter, particularly via the measurement flow passage 81.
- the main flow path of the fluid in such a flow meter is indicated by an arrow X in FIG.
- a filter for removing foreign substances in the fluid can be provided in the flow path in the fluid storage section, for example, below the flow path defining member 9.
- the gain is compared with a predetermined value in the comparator, and the output of the comparator is input to the heater control unit.
- the heat control unit controls the heat generation of the heater of the flow rate sensor 10 via the buffer according to the input signal. This control is performed so that the temperature-sensitive resistor Tw of the flow rate sensor 10 maintains a predetermined temperature-sensitive state, that is, an input signal to the heater control unit maintains a predetermined value.
- This control state corresponds to the instantaneous flow rate, and the data (measured flow rate data) is input to the flow rate conversion circuit.
- the flow rate conversion circuit calculates and converts the flow rate of the fluid to be measured based on the flow rate data input from the flow rate detection circuit and the fluid temperature data input from the temperature sensor circuit.
- a display unit, a communication circuit, an EPROM, and a reference clock are connected to the CPU including the flow rate conversion circuit as described above. Data required for the operation is stored in the memory EEPPR0M.
- Fig. 9 shows the calibration curve of kerosene stored in the memory as the storage means in advance.
- This calibration curve instantaneous flow rate conversion table
- This calibration curve is a data table showing the relationship between the flow rate detection circuit output and the instantaneous flow rate corresponding to the integrated value of the heater applied voltage for 0.5 seconds, and is created for each discrete temperature. It consists of multiple individual calibration curves.
- FIG. 9 shows individual calibration curves ⁇ to ⁇ 4 for four discrete temperatures T to T 4 (5 ° C., 15 ° C., 25 ° C., and 35 ° C.). Although each calibration curve is drawn as a continuous line in FIG. 9, this is for convenience of explanation, and in fact, the output voltage value of the discrete flow detection circuit shown in FIG. 9 ⁇ CJ It shows the correspondence between CJ « and the instantaneous flow rate.
- Kerosene is supplied from a kerosene tank through piping.
- a pipe is provided with a cock near the tip opening, and when the cock is opened, kerosene is supplied from the tip opening into the measuring container arranged on the balance, and is supplied into the measuring container. The weight of the kerosene is measured by a balance.
- the pipe passes through a thermostat, and the pipe in the thermostat has a coil shape.
- a flow meter is attached to the pipe section following the coil pipe section. The temperature in the thermostat is maintained at T, and kerosene, which has been brought to the temperature T by passing through the coil-shaped piping, passes through the flow meter.
- F AB (F A -FB) (E h-E AR m) / (EARHI + I-E AR m)
- the data capacity of the individual calibration curve can be reduced, and this flow rate is already at the reference temperature. Since it is a converted value (calibration value), it is possible to perform instantaneous flow measurement with extremely small measurement error.
- the measured amount corresponds to the amount of heat generated by burning kerosene as much as possible.
- the flow measurement of the embodiment of the present invention which measures the amount of the substance more accurately, is preferable.
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Details Of Flowmeters (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-7001422A KR20030022342A (ko) | 2000-08-10 | 2001-08-10 | 유량 측정방법 및 유량계 |
EP01956839A EP1326062A1 (en) | 2000-08-10 | 2001-08-10 | Flow rate measuring method and flow-meter |
US10/344,033 US6983214B2 (en) | 2000-08-10 | 2001-08-10 | Flow rate measuring method and flow-meter |
CA002418661A CA2418661A1 (en) | 2000-08-10 | 2001-08-10 | Flow rate measuring method and flow-meter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000243226A JP2002054964A (ja) | 2000-08-10 | 2000-08-10 | 流量測定方法及び流量計 |
JP2000-243226 | 2000-08-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002014799A1 true WO2002014799A1 (fr) | 2002-02-21 |
Family
ID=18734114
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/006923 WO2002014799A1 (fr) | 2000-08-10 | 2001-08-10 | Procede servant a mesurer un debit et debitmetre |
Country Status (7)
Country | Link |
---|---|
US (1) | US6983214B2 (ja) |
EP (1) | EP1326062A1 (ja) |
JP (1) | JP2002054964A (ja) |
KR (1) | KR20030022342A (ja) |
CN (1) | CN1240997C (ja) |
CA (1) | CA2418661A1 (ja) |
WO (1) | WO2002014799A1 (ja) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7536900B2 (en) | 2003-07-11 | 2009-05-26 | Mitsui Mining & Smelting Co., Ltd. | Leak detector and leak detecting system using the same |
US7030768B2 (en) * | 2003-09-30 | 2006-04-18 | Wanie Andrew J | Water softener monitoring device |
EP1779073A4 (en) * | 2004-08-13 | 2008-05-07 | Entegris Inc | SYSTEM AND METHOD FOR CALIBRATING A FLOW APPARATUS |
US20090122831A1 (en) * | 2007-11-14 | 2009-05-14 | Ema Electronics Corp. | Intelligent flow/temperature measuring device |
JP5276470B2 (ja) * | 2009-02-25 | 2013-08-28 | ベックマン コールター, インコーポレイテッド | 分析装置および分析方法 |
KR101084275B1 (ko) * | 2009-09-22 | 2011-11-16 | 삼성모바일디스플레이주식회사 | 소스 가스 공급 유닛, 이를 구비하는 증착 장치 및 방법 |
DE102010028267A1 (de) * | 2010-04-27 | 2011-10-27 | Robert Bosch Gmbh | Vorrichtung zur Erfassung einer Eigenschaft eines strömenden fluiden Mediums |
IL213767A (en) | 2011-06-23 | 2017-05-29 | Adler Michael | A method and device for measuring fluid flow rate |
JP5743922B2 (ja) * | 2012-02-21 | 2015-07-01 | 日立オートモティブシステムズ株式会社 | 熱式空気流量測定装置 |
US9207109B2 (en) * | 2013-04-09 | 2015-12-08 | Honeywell International Inc. | Flow sensor with improved linear output |
US10591332B2 (en) * | 2015-08-31 | 2020-03-17 | Hitachi Automotive Systems, Ltd. | Airflow meter |
KR101776582B1 (ko) * | 2017-01-23 | 2017-09-08 | 서명철 | 수도미터의 성능 검사방법 |
USD1011943S1 (en) | 2017-10-13 | 2024-01-23 | Aj1E Superior Solutions, Llc | Salt tank monitor |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08159838A (ja) * | 1994-12-09 | 1996-06-21 | Ricoh Co Ltd | 流量計 |
JPH11153466A (ja) * | 1997-11-21 | 1999-06-08 | Mitsui Mining & Smelting Co Ltd | 流量センサー |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3891391A (en) * | 1973-05-14 | 1975-06-24 | George R Boone | Fluid flow measuring system using improved temperature compensation apparatus and method |
EP0132374B1 (en) * | 1983-07-20 | 1988-01-20 | Tokyo Tatsuno Company Limited | Device for measuring liquid flow volume with temperature compensating |
JPH0663803B2 (ja) * | 1989-08-07 | 1994-08-22 | 山武ハネウエル株式会社 | 零点補償方法 |
JPH11118566A (ja) | 1997-10-15 | 1999-04-30 | Mitsui Mining & Smelting Co Ltd | 流量センサー |
-
2000
- 2000-08-10 JP JP2000243226A patent/JP2002054964A/ja not_active Withdrawn
-
2001
- 2001-08-10 CA CA002418661A patent/CA2418661A1/en not_active Abandoned
- 2001-08-10 CN CNB018129609A patent/CN1240997C/zh not_active Expired - Fee Related
- 2001-08-10 KR KR10-2003-7001422A patent/KR20030022342A/ko not_active Application Discontinuation
- 2001-08-10 EP EP01956839A patent/EP1326062A1/en not_active Withdrawn
- 2001-08-10 WO PCT/JP2001/006923 patent/WO2002014799A1/ja not_active Application Discontinuation
- 2001-08-10 US US10/344,033 patent/US6983214B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08159838A (ja) * | 1994-12-09 | 1996-06-21 | Ricoh Co Ltd | 流量計 |
JPH11153466A (ja) * | 1997-11-21 | 1999-06-08 | Mitsui Mining & Smelting Co Ltd | 流量センサー |
Also Published As
Publication number | Publication date |
---|---|
CN1443301A (zh) | 2003-09-17 |
KR20030022342A (ko) | 2003-03-15 |
US6983214B2 (en) | 2006-01-03 |
CA2418661A1 (en) | 2002-02-21 |
CN1240997C (zh) | 2006-02-08 |
EP1326062A1 (en) | 2003-07-09 |
JP2002054964A (ja) | 2002-02-20 |
US20030167837A1 (en) | 2003-09-11 |
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